Definition of pessimism noun from the Oxford Advanced Learner's Dictionary

 

pessimism

 noun
noun
BrE BrE//ˈpesɪmɪzəm//
 
; NAmE NAmE//ˈpesɪmɪzəm//
 
 
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[uncountable] pessimism (about/over something) a feeling that bad things will happen and that something will not be successful; the tendency to have this feeling There is a mood of pessimism in the company about future job prospects. This widespread pessimism does not seem justified. opposite optimism Word Origin late 18th cent.: from Latin pessimus ‘worst’, on the pattern of optimism.Extra examples He warned against the dangers of undue pessimism. The article reflects the pessimism of its author. There were good grounds for pessimism about future progress. the widespread pessimism among young people today
See the Oxford Advanced American Dictionary entry: pessimism